class TimerModel {
  int _start = 1739254718264;

  int _difference = 0;

  int get difference  => _difference;

  TimerModel(int start) {
    _start = start;
  }

  calculateTimeDifference() {
    _difference = (DateTime.now().millisecondsSinceEpoch - _start ) ~/ 60000;
    print(_difference);
  }
}